Door guard



C. WHITE DOOR GUARD June 11, 1968 2 Sheets-Sheet l Filed sept. 26, 196e G, l

MMM# 2 mw d G M M Clemens 47% C. WHITE DOOR` GUARD June 11, 1968 2 Sheets-Sheet 2 Filed Sept. 26, 1966 wwf/QQ Mr@ Mg/S Clemens United States Patent O 3,387,875 DOOR GUARD Clemens White, 400 Deming Place, Chicago, Ill. 60614 Filed Sept. 26, 1966, Ser. No. 582,118 10 Claims. (Cl. 292-262) This invention relates to door guards or similar locking devices for doors or the like.

One object of the present invention is to provide a new and improved door guard which may be operated to three positions, comprising a dead locked position in which the door is held completely closed under all conditions, a door answering position in which the door is locked but may be opened a small amount in response to a knock or other summons by a caller, and an open position in which the door may be opened freely without any interference from the door guard.

A further object is to provide a new and improved door guard of the foregoing character which is operated simply by pushing and rotating a knob.

Another object is to provide such a new and improved door guard having a telescopically extensible member which is operative when the door guard is in its door answering position, so as to provide for the opening of the door by a small amount.

It is another object to provide such a new and improved door guard in which the operating knob cannot be rotated to its open position unless the door is completely closed. In this way, it is impossible for a wouldbe intruder to turn the knob to its open position by reaching through the partially open doorway when the door guard is in its door answering position.

A further object is to provide a new and improved door guard which is highly effective, yet is attractive in appearance and reasonably low in cost.

Further objects and advantages of the present invention will appear from the following description, taken with the accompanying drawings, in which:

FIG. 1 is a fragmentary, somewhat diagrammatic horizontal section taken through a door guard, to be described as an illustrative embodiment of the present invention.

FIG. 2 is a fragmentary vertical section, taken generally along the line 2-2 in FIG. 1.

FIG. 3 is a side elevational view of the door guard.

FIG. 4 is a vertical section taken generally along the line 4--4 in FIG. 3, and showing the door guard in its dead locked position.

FIG. 5 is a `sectional view similar to FIG. 4 but showing the door guard in its open or released position.

FIG. 6 is a sectional view similar to FIGS. 4 and 5 but showing the door guard in its door answering position.

FIG. 7 is a fragmentary section taken generally along the line 7-7 in FIG. 1.

FIG. 8 is an elevational view of a component of the door guard, comprising a locking pin mounted in a ring.

FIG. 9 is an elevational view of a locking hub, constituting another component of the door guard.

FIG. 10 is a plan view showing the locking hub of FIG. 9.

Referring to the drawings more specifically, it will be seen that FIG. 1 illustrates a door guard 2t) for use with an entrance door 22 of an apartment, house or the like. The door guard 20 is mounted partly on the door 22 and partly on the door jamb 26 in which the `door is mounted. Thus, the door guard 20 has a main mounting :bracket 28 which is mounted on the jamb 26. To prevent unauthorized removal of the bracket 28 from the jamb 26, the bracket is preferably secured to the jamb 26 by means of screws 30 having spoiled slots 32 (FIG. 3), which will hold a screwdriver for inserting the screws but will not hold a screwdriver for removing the screws.

Generally speaking, the door guard 20 comprises a rotatable operating knob 34 whereby the door guard may be operated to each of its three positions: the dead locked position of FIG. 4, the open position of FIG. 5, and the door answering position of FIG. 6. The door guard is shown in its dead locked position in FIG. 1, and also is shown in broken lines in its door answering position. The door is shown in its dead locked position in FIGS. 2 and 3, and also in its open position in broken lines in FIG. 3.

To provide for the locking of the door, the operating knob 34 is formed with a locking ange 36 which is hook shaped in cross section, as shown in FIG. 1. Thus, the ange 36 has a radial leg 36a which projects outwardly from the knob 34, a circumferential leg 36h which projects endwise from the leg 36a, and an inwardly directed leg or hook 36C which projects inwardly from the circumferential leg 36h and is spaced away from the radial leg 36a. When viewed in elevation, the locking ange 36 is generally semi-circular in shape, as Will be evident from FIGS. 4-6.

To lock the door 22, the locking ange 36 is movable into interlocking engagement with a hook or ange 38 which is formed on a lbracket 40. Screws 42 or other siutable fasteners are employed to mount the bracket 40 on the door 22. The hook 3S comprises a leg 38a which projects outwardly from the bracket 40, substantially at right angles to the door 22, and a nger 38b which projects laterally from the leg 38a. It will be seen from FIG. 1 that the linger 38h is adapted to interlock with the hook member 36C of the locking flange 36.

As shown in FIG. 5, the knob 34 can be rotated into a position in which the locking ilange 36 is entirely clear of the hook 38, so that the door can be opened freely, without -any interference from the door guard. It will be seen that the knob 34 has a at side 44 which affords clearance for the swing of the door. As shown in FIGS. 1 and 2, the knob 34 may be .rotated so that the locking ange 36 will interlock with the hook 38 on the door 22. In this way, the knob 34 is securely connected to the door 22.

To provide for the dead locking of the door, the door guard is provided with a stationary hook or flange 46, adapted to interlock with the locking flange 36K. In this case, the stationary hook 46 is formed integrally with the main mounting bracket 28. It will be seen that the stationary hook 46 comprises a leg 46a which projects outwardly from the bracket 28, generally at right angles t0 the door jamb 26, and a finger 46b which projects laterally from the leg 46a. The finger 4Gb is adapted to interlock with the hook member 36C on the locking ange 36.

As shown in FIG. 4, the knob 34 may be rotated into a position in which the locking ilange 36 interlocks with the stationary hook 46, and also with the hook 38 on the door 22. In this position, the stationary hook 46 has the etect of dead locking the door. Thus, the stationary hook 46 cooperates with the locking flange 36 to prevent extension of the knob 34. The locking tlange 36 cooperates with the hook 38 to prevent the opening of the door 22. In the position shown in FIG. 6, the flange 36 interlocks with the hook 38 on the door, but does not interlock with the stationary hook 46. Thus, the stationary hook is no longer able to prevent extension of the knob 34. This represents the door answering position of the door guard.

As already indicated, the knob 34 is extensibly mounted on the mounting bracket 28. In addition, the knob 34 is mounted for limited swinging movement, so that the knob can follow the swinging movement of the door 22 when the knob is in its door answering position. To provide for the swinging movement, the mounting arrangement comprises a pair of pivot pins or trnnnions 50. The leg 46a is lformed with an opening 52 for receiving the lower pivot pin 50. Another leg 56 projects outwardly from the bracket 28 and is formed with an opening 58 to receive the upper pivot pin 50.

It will be seen that the pins 50 project outwardly in diametrically opposite directions from a member 60 which supports the knob 34.

As shown to best advantage in PIG. 1, the member 60 is generally cup shaped and is formed with a cylindrical outer wall 62 and a at end wall 64. It will be seen that a spring 66 is connected between the end wall `64 and the mounting bracket 28. The illustrated spring 66 is of the leaf type and is secured to the end wall 64 by means of rivets or drive screws 68. The spring 66 is effective to bias the supporting member 60 and the knob 34 into an angular position, in which the knob 34 is swung slightly toward the door 22. This angular position of the knob facilitates the engagement of the locking flange 36 with the hooks 38 and 46. The rivets 68 serve as stops to limit the swinging movement of the supporting member 60 on the pivot pins or trunnions 50.

The knob 34 is rotatably and extensibly mounted on the supporting member 60. To provide for the rotation of the knob 34, a bushing or hub 70 is rotatably mounted in the supporting member 60. The hub 70 is retained in the member 60 by an in-turned flange 72 on the outer end thereof.

To provide `for the extension of the knob 34, the hub 70 is connected to the knob 34 by a series of telescopically engaged members 81, 82, 83, 84 and 85. While tive members are employed in this instance, it will be understood that a smaller or greater number of extensible members may be employed. The telescoping members 81-85 are of successively smaller diameters and are telescoped within one another. The four outer members 81-84 are in the form of tubes or sleeves, while the innermost member 85 is in the form of a central rod. lt will be seen that the rod 85 is connected directly to the knob 34, while the outer-most sleeve 81 is secured to the hub 70. The illustrated knob 34 has an end wall 86 which is formed with a central opening 88. The central rod 85 has a reduced end portion 90 which extends through the opening 88 and is upset or riveted so as to form a retaining head 92.

The outer-most sleeve 81 is formed with an in-turned tlange 94 which is brazed or otherwise suitably secured to the hub 70. Thus, the sleeve 81 is adapted to rotate with the hub 70.

In order to limit the extension of the sleeves 8284, the inner ends of the sleeves are formed with outwardly turned lips 98, which. are engageable with inwardly turned lips 100 on the outer ends of the sleeves 81-83. To pro vide room for the lips l98 and 100, the sleeves 481 and 83 are round in cross section, while the sleeves 82 and 84 are square.

The lips 98 and 100, in conjunction with the square sleeves 82 and 84, prevent relative rotation between the sleeves 81-84, so that all of them rotate together when the knob 34 is turned. The central rod 85 is generally square in cross section so as to prevent relative rotation between the rod 8S and the sleeve 84. The extension of the rod 85 relative to the sleeve 84 is limited by lips 102 which extend into longitudinal grooves 104 formed in the central rod 85. The grooves 104 extend along most of the length of the central rod `85 but terminate near the inner end of the rod to form shoulders 106 for engagement with the lips 102.

In the door answering position of the door guard, the knob 34 may be extended, as shown in broken lines in FIG. 1, so that the door may be opened by a small amount, suicient to observe and recognize any caller who cornes to the door. The extension of the knob 34 is limited so that any would-be intruder would be unable to force open. the door. In the door answering position of the door guard, the locking flange 36 is engaged with the hook 3S on the door 22, but not with the stationary hook 46. Thus, the knob 34 and the members -81-85 can be extended as indicated in broken lines in FIG. l.

A safety latching arrangement is provided to prevent the knob 34 from being rotated except when the door 22 is fully closed, and the knob 34 is fully retracted. This arrangement makes it impossible for a wouldbe intruder to turn the knob by reaching through the partially open doorway when the door guard is in its door answering position. The illustrated latching arrangement is effective to prevent the rotation of the hub 70 `relative to the supporting member 60, unless the knob 34 is fully retracted. In fact, the knob 34 must be pushed inwardly beyond its fully retracted position. The hub 70 is latched by a pin 110 which is captive within the supporting member 60. As shown to best advantage in FTGS. 1 and 8, the pin 110 is lmounted diametrically in a ring 112 which is slidable axially within the supporting member 60. The outer ends of the pin 110 project beyond the ring 112 and are received in longitudinal slots 114 formed in the cylindrical wall 62 of the member 60. The slots 114 prevent relative rotation between the pin 110 and the supporting member 60, while permitting the pin to slide 1ongitudinally relative to the axis of the member 60.

To receive the pin 110, the inner face of the hub 70 is formed with radial slots 116 which are spaced at intervals of degrees. When the pin 110 is engaged with either pair of the slots 116, the pin prevents the hub 70 from being rotated. A spring 118 is provided in the supporting member 60 to bias the pin 110 against the hub 70 so that the pin will be retained in the slots 116. The illustrated spring 118 is in the form of a conical coil spring. The smaller end of the spring 118 engages the end wall 64, while the larger end of the spring engages the ring 112.

The central rod 85 is employed to disengage the pin from the slots 116. Thus, the rod 85 is movable inwardly through an opening 120 in the hub 70. The inner end of the rod can be brought into engagement with the pin 110. Moreover, the rod 85 is long enough so that the pin 110 can be pushed out of the slots 116 by pushing inwardly on the knob 34. When the pin 110 is disengaged from the slots 116, the hub 70 is released so that the knob 34 can be rotated, along with the hub 70 and the extensible members 81-85. It will be evident that the knob 34 can be latcbed in four distinct positions, three of which, are the dead locking, the door answering, and the open position. The fourth position is not used and can be blocked out with a stop if desired.

It will undoubtedly be helpful to summarize the operation of the door guard 20. FIG. 5 illustrates the open or unlocked position of the door guard, in which neither the door mounted hook 38 nor the stationary hook 46 is engaged with the locking flange 36 on the knob 34.

To dead lock the door 22, the knob 34 is pushed inwardly and then is rotated through degrees to the position shown in FIG. 4, in which the locking Hange 36 is interlocked with both the door mounted hook 38 and the stationary hook l46. The inward pressure on the knob 34 causes the central rod 85 to push the latching pin 110 out of the slots 116 in the hub 70 so that the hub 70 can be rotated. When the knob 34 is in its dead locking position, as shown in FIG. 4, the knob is released so that the latching pin 110 will again enter the slots `116. In this way, the hub 70 is prevented from rotating. The knob 34 is also prevented from rotating, inasmuch as the knob 34 is non-rotatably connected to the hub 70 by the extensible members SL85.

When it is desired to operate the door guard to its door answering position, the knob 34 is pressed inwardly and is rotated through 90 degrees to the position shown in FlG. 6, in which the locking flange 36 interlocks with the door mounted hook 38, but not with the stationary hook 46. The knob 34 is then released so that the pin 110 will interlock with the slots 116, to prevent the knob from being rotated. In this position of the door guard, the door 22 may be opened by a small amount, so that it is possible to observe and recognize any caller at the door. As the door is opened, the knob 34 is extended, as shown in broken lines in FIG. 1. The telescopically engaged members 81-85 provide for such extending movement of the knob 34.

It is impossible to rotate the knob 34 when it is extended. Thus, it is impossible for a wouldebe intruder to turn the knob to its open position by reaching through the partially open doorway when the knob is extended. To rotate the knob 34, it is necessary to close the door 22 completely so that the knob 34 will be fully retracted. It then is necessary to press the knob inwardly so that the central rod 8S will release the pin 110 from the slots 116. The knob cannot be pressed inwardly unless the door 22 is completely closed. There is no way that this safety feature of the door guard can be defeated by a would-be intruder.

It will be evident that the door guard is highly effective. At the same time, it is unobtrusive and attractive in appearance. Moreover, it is easy to manufacture and low in cost.

Various other modifications, alternative constructions, and equivalents may be employed without departing from the true spirit and scope of the invention, as exemplied in the foregoing description and defined in the following claims.

I claim:

1. In a door guard,

the combination comprising a bracket adapted to be mounted on a door janrb adjacent the door to be controlled,

a Iirst member mounted on said bracket,

a second member mounted on said rst member for rotation relative thereto,

an extensible member mounted on said second member,

a locking member mounted on said extensible member and extensible therewith,

said extensible member and said locking member being rotatable with said second member,

said locking member being rotatable to a fully locked position, a partially locked position and an open position,

means on said locking member cooperating with means lon the jamb and door for holding the door when said locking member is in said fully locked position and said partially locked position while providing for opening movement of the door when said locking member is in said open position,

and means cooperating with means on the jamb for preventing extension of said extensible member when said locking member is in said fully locked position to hold the door in a fully closed position,

and means cooperating with means on the door and eiective to provide for extension of said extensible member and said locking member when said locking member is in said partially locked position to provide for partial opening movement of the door.

2. A combination according to claim 1,

including latching means for retaining said locking member in said fully locked and partially locked positions against rotation.

3. A combination according to claim 1,

including latching means for retaining said locking member in said fully locked and partially locked positions against rotation,

and means operable by full inward movement of said locking means toward said door for releasing said latching means to provide for rotation of said locking member away from said fully locked and partially locked positions.

4. A combination according to claim 1,

including a latching mechanism disposed between said first and second members to retain said second member and said locking member in said fully locked and partially locked positions against rotation,

said latching mechanism including a latching pin,

slots formed in said first and second members for receiving said pin to prevent rotation of said second member,

means biasing said pin into engaged relation between said slots,

and means for moving said pin out of one of said slots to release said latching mechanism.

5. A combination according to claim 1,

including a latching mechanism connected between said first and second members to hold said second member and said` locking member in said fully locked and partially locked positions against rotation,

said latching mechanism including a latching pin,

slots formed in said first and second members for receiving said pin,

means lbiasing said pin into engaged relation between said slots to prevent rotation of said second member,

and means operable by inward movement of said locking member toward said door for disengaging said pin from one of said slots to release said latching mechanism whereby said locking member can be rotated away from s-aid partially locked and fully locked positions.

6. A combination according to claim 1,

wherein said means on the door comprises a member adapted to be mounted for engagement with said locking member in said fully locked and partially locked positions thereof,

and said means on the jamb comprises a stationary member adapted to be mounted for engagement with said locking member when said locking member is in said fully locked position,

said stationary member being effective to prevent extension of said locking member and said extensible member.

7. A combination according to claim 6,

in which said locking member and said stationary member are provided with interengageable hook shaped portions for preventing extension of said locking member.

8. A combination according to claim 1,

Aincluding pivot means connected between said bracket and said first member to provide for lateral swinging movement of said first member,

said second member,

said extensible member .and said locking member beling swingable with said first 4member to follow the swinging movement of the door.

9. A combination according to claim 8,

including spring means connected between said bracket and said rst member for biasing said first member in one direction of swinging movement about said pivot means.

10. A combination according to claim 1,

in which said locking member includes Ian operating knob having a locking ange thereon,

said means on the door comprising a tlange engageable with said locking flange in the fully locked and partially locked positions of said locking mem-ber,

said means on the jamb comprising a stationary iiange engageable with said locking flange in the fully locked position of said locking member to prevent extension of said locking member and said extensible member.

a latching mechanism connected between said first and second members for holding said second member and said locking member in said fully locked and partially locked positions,

7 8 said latching mechanism including a latching pin, References Cited slotshformed. -in .said rst and second members for re- UNITED STATES PATENTS ceivlng said pm, means biasing said pin into engaged relation between 654,723 7/1900 Franks 292-262 said slots to prevent rotation of said second member, 5 212001627 5/1940 Levy 292-262 land a member Amounted on said locking member for l moving said pin out of one of said slots to release MARVIN A CHAMPION P'lmary Examine" said latching mechanism when said knob is pushed EDWARD I. MCCARTHY, Assistant Examiner. inwardly toward the door. 

1. IN A DOOR GUARD, THE COMBINATION COMPRISING A BRACKET ADAPTED TO BE MOUNTED ON A DOOR JAMB ADJACENT THE DOOR TO BE CONTROLLED, A FIRST MEMBER MOUNTED ON SAID BRACKET, A SECOND MEMBER MOUNTED ON SAID FIRST MEMBER FOR ROTATION RELATIVE THERETO, AN EXTENSIBLE MEMBER MOUNTED ON SAID SECOND MEMBER, A LOCKING MEMBER MOUNTED ON SAID EXTENSIBLE MEMBER AND EXTENSIBLE THEREWITH, SAID EXTENSIBLE MEMBER AND SAID LOCKING MEMBER BEING ROTATABLE WITH SAID SECOND MEMBER, SAID LOCKING MEMBER BEING ROTATABLE TO A FULLY LOCKED POSITION, A PARTIALLY LOCKED POSITION AND AN OPEN POSITION, MEANS ON SAID LOCKING MEMBER COOPERATING WITH MEANS ON THE JAMB AND DOOR FOR HOLDING THE DOOR WHEN SAID LOCKING MEMBER IS IN SAID FULLY LOCKED POSITION AND SAID PARTIALLY LOCKED POSITION WHILE PROVIDING FOR OPENING MOVEMENT OF THE DOOR WHEN SAID LOCKING MEMBER IS IN SAID OPEN POSITION, AND MEANS COOPERATING WITH MEANS ON THE JAMB FOR PREVENTING EXTENSION OF SAID EXTENSIBLE MEMBER WHEN SAID LOCKING MEMBER IS IN SAID FULLY LOCKED POSITION TO HOLD THE DOOR IN A FULLY CLOSED POSITION, AND MEANS COOPERATING WITH MEANS ON THE DOOR AND EFFECTIVE TO PROVIDE FOR EXTENSION OF SAID EXTENSIBLE MEMBER AND SAID LOCKING MEMBER WHEN SAID LOCKING MEMBER IS IN SAID PARTIALLY LOCKED POSITION TO PROVIDE FOR PARTIAL OPENING MOVEMENT OF THE DOOR. 